grid_search.py

import argparse
import itertools
import json
import os
import random
from typing import Optional, Tuple, Union

import numpy as np
import torch
from sklearn.metrics import accuracy_score, f1_score
from torch.nn import BCEWithLogitsLoss, CrossEntropyLoss, MSELoss
from torch.utils.data import Dataset, DataLoader
from tqdm import tqdm
from transformers import AdamW, get_linear_schedule_with_warmup
from transformers import GPT2Config, GPT2ForSequenceClassification
from transformers import GPT2Tokenizer, AutoTokenizer, GPTJConfig, GPTJForSequenceClassification
from transformers import logging
from transformers.modeling_outputs import SequenceClassifierOutputWithPast
from transformers.utils.model_parallel_utils import assert_device_map, get_device_map

logger = logging.get_logger(__name__)

def load_label(dataset):
    data_path = os.path.join("config/tasks", "{}.json".format(dataset))

    with open(data_path, "r") as f:
        for line in f:
            dp = json.loads(line)
            label = dp["options"]
            label_list = {k: v for v, k in enumerate(label)}

    return label_list


class ICLData(Dataset):
    def __init__(self, data_path):

        self.texts = []
        self.labels = []

        with open(data_path, "r") as f:
            for line in f:
                dp = json.loads(line)
                self.texts.append(dp["input"])
                self.labels.append(dp["output"])

    def __len__(self):
        return len(self.texts)

    def __getitem__(self, item):
        return {'text': self.texts[item], 'label': self.labels[item]}


class GPTJClassificationParallel(GPTJForSequenceClassification):
    def __int__(self, config):
        super().__init__(config)

        self.model_parallel = False
        self.device_map = None

    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Tuple[Tuple[torch.Tensor]]] = None,
        attention_mask: Optional[torch.FloatTensor] = None,
        token_type_ids: Optional[torch.LongTensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        head_mask: Optional[torch.FloatTensor] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        labels: Optional[torch.LongTensor] = None,
        use_cache: Optional[bool] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[Tuple, SequenceClassifierOutputWithPast]:
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        transformer_outputs = self.transformer(
            input_ids,
            past_key_values=past_key_values,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )
        hidden_states = transformer_outputs[0]

        if self.model_parallel:
            torch.cuda.set_device(self.transformer.first_device)
            hidden_states = hidden_states.to(self.score.weight.device)

        logits = self.score(hidden_states)

        if input_ids is not None:
            batch_size = input_ids.shape[0]
        else:
            batch_size = inputs_embeds.shape[0]

        if self.config.pad_token_id is None and batch_size != 1:
            raise ValueError("Cannot handle batch sizes > 1 if no padding token is defined.")
        if self.config.pad_token_id is None:
            sequence_lengths = -1
        else:
            if input_ids is not None:
                sequence_lengths = torch.ne(input_ids, self.config.pad_token_id).sum(-1) - 1
            else:
                sequence_lengths = -1
                logger.warning(
                    f"{self.__class__.__name__} will not detect padding tokens in `inputs_embeds`. Results may be "
                    "unexpected if using padding tokens in conjunction with `inputs_embeds.`"
                )

        pooled_logits = logits[torch.arange(batch_size, device=logits.device), sequence_lengths]

        loss = None
        if labels is not None:
            if self.config.problem_type is None:
                if self.num_labels == 1:
                    self.config.problem_type = "regression"
                elif self.num_labels > 1 and (labels.dtype == torch.long or labels.dtype == torch.int):
                    self.config.problem_type = "single_label_classification"
                else:
                    self.config.problem_type = "multi_label_classification"

            if self.config.problem_type == "regression":
                loss_fct = MSELoss()
                if self.num_labels == 1:
                    loss = loss_fct(pooled_logits.squeeze(), labels.squeeze())
                else:
                    loss = loss_fct(pooled_logits, labels)
            elif self.config.problem_type == "single_label_classification":
                loss_fct = CrossEntropyLoss()
                loss = loss_fct(pooled_logits.view(-1, self.num_labels), labels.view(-1))
            elif self.config.problem_type == "multi_label_classification":
                loss_fct = BCEWithLogitsLoss()
                loss = loss_fct(pooled_logits, labels)
        if not return_dict:
            output = (pooled_logits,) + transformer_outputs[1:]
            return ((loss,) + output) if loss is not None else output

        return SequenceClassifierOutputWithPast(
            loss=loss,
            logits=pooled_logits,
            past_key_values=transformer_outputs.past_key_values,
            hidden_states=transformer_outputs.hidden_states,
            attentions=transformer_outputs.attentions,
        )

    def parallelize(self, device_map=None):
        # Check validity of device_map
        self.device_map = (
            get_device_map(len(self.transformer.h), range(torch.cuda.device_count())) if device_map is None else device_map
        )
        assert_device_map(self.device_map, len(self.transformer.h))
        self.transformer.parallelize(self.device_map)
        self.score = self.score.to(self.transformer.first_device)
        self.model_parallel = True

    def deparallelize(self):
        self.transformer.deparallelize()
        self.transformer = self.transformer.to("cpu")
        self.score = self.score.to("cpu")
        self.model_parallel = False
        torch.cuda.empty_cache()


class GPT2ClassificationParallel(GPT2ForSequenceClassification):
    def __int__(self, config):
        super().__init__(config)

        self.model_parallel = False
        self.device_map = None

    def forward(
        self,
        input_ids: Optional[torch.LongTensor] = None,
        past_key_values: Optional[Tuple[Tuple[torch.Tensor]]] = None,
        attention_mask: Optional[torch.FloatTensor] = None,
        token_type_ids: Optional[torch.LongTensor] = None,
        position_ids: Optional[torch.LongTensor] = None,
        head_mask: Optional[torch.FloatTensor] = None,
        inputs_embeds: Optional[torch.FloatTensor] = None,
        labels: Optional[torch.LongTensor] = None,
        use_cache: Optional[bool] = None,
        output_attentions: Optional[bool] = None,
        output_hidden_states: Optional[bool] = None,
        return_dict: Optional[bool] = None,
    ) -> Union[Tuple, SequenceClassifierOutputWithPast]:
        r"""
        labels (`torch.LongTensor` of shape `(batch_size,)`, *optional*):
            Labels for computing the sequence classification/regression loss. Indices should be in `[0, ...,
            config.num_labels - 1]`. If `config.num_labels == 1` a regression loss is computed (Mean-Square loss), If
            `config.num_labels > 1` a classification loss is computed (Cross-Entropy).
        """
        return_dict = return_dict if return_dict is not None else self.config.use_return_dict

        transformer_outputs = self.transformer(
            input_ids,
            past_key_values=past_key_values,
            attention_mask=attention_mask,
            token_type_ids=token_type_ids,
            position_ids=position_ids,
            head_mask=head_mask,
            inputs_embeds=inputs_embeds,
            use_cache=use_cache,
            output_attentions=output_attentions,
            output_hidden_states=output_hidden_states,
            return_dict=return_dict,
        )
        hidden_states = transformer_outputs[0]

        if self.model_parallel:
            torch.cuda.set_device(self.transformer.first_device)
            hidden_states = hidden_states.to(self.score.weight.device)

        logits = self.score(hidden_states)

        if input_ids is not None:
            batch_size, sequence_length = input_ids.shape[:2]
        else:
            batch_size, sequence_length = inputs_embeds.shape[:2]

        assert (
            self.config.pad_token_id is not None or batch_size == 1
        ), "Cannot handle batch sizes > 1 if no padding token is defined."
        if self.config.pad_token_id is None:
            sequence_lengths = -1
        else:
            if input_ids is not None:
                sequence_lengths = torch.ne(input_ids, self.config.pad_token_id).sum(-1) - 1
            else:
                sequence_lengths = -1
                logger.warning(
                    f"{self.__class__.__name__} will not detect padding tokens in `inputs_embeds`. Results may be "
                    "unexpected if using padding tokens in conjunction with `inputs_embeds.`"
                )

        pooled_logits = logits[torch.arange(batch_size, device=logits.device), sequence_lengths]

        loss = None
        if labels is not None:
            if self.config.problem_type is None:
                if self.num_labels == 1:
                    self.config.problem_type = "regression"
                elif self.num_labels > 1 and (labels.dtype == torch.long or labels.dtype == torch.int):
                    self.config.problem_type = "single_label_classification"
                else:
                    self.config.problem_type = "multi_label_classification"

            if self.config.problem_type == "regression":
                loss_fct = MSELoss()
                if self.num_labels == 1:
                    loss = loss_fct(pooled_logits.squeeze(), labels.squeeze())
                else:
                    loss = loss_fct(pooled_logits, labels)
            elif self.config.problem_type == "single_label_classification":
                loss_fct = CrossEntropyLoss()
                loss = loss_fct(pooled_logits.view(-1, self.num_labels), labels.view(-1))
            elif self.config.problem_type == "multi_label_classification":
                loss_fct = BCEWithLogitsLoss()
                loss = loss_fct(pooled_logits, labels)
        if not return_dict:
            output = (pooled_logits,) + transformer_outputs[1:]
            return ((loss,) + output) if loss is not None else output

        return SequenceClassifierOutputWithPast(
            loss=loss,
            logits=pooled_logits,
            past_key_values=transformer_outputs.past_key_values,
            hidden_states=transformer_outputs.hidden_states,
            attentions=transformer_outputs.attentions,
        )

    def parallelize(self, device_map=None):
        # Check validity of device_map
        self.device_map = (
            get_device_map(len(self.transformer.h), range(torch.cuda.device_count())) if device_map is None else device_map
        )
        assert_device_map(self.device_map, len(self.transformer.h))
        self.transformer.parallelize(self.device_map)
        self.score = self.score.to(self.transformer.first_device)
        self.model_parallel = True

    def deparallelize(self):
        self.transformer.deparallelize()
        self.transformer = self.transformer.to("cpu")
        self.score = self.score.to("cpu")
        self.model_parallel = False
        torch.cuda.empty_cache()


class Gpt2ClassificationCollator(object):
    def __init__(self, tokenizer, labels_encoder, max_sequence_len=None):
        self.tokenizer = tokenizer
        self.max_sequence_len = self.tokenizer.model_max_length if max_sequence_len is None else max_sequence_len
        self.labels_encoder = labels_encoder

    def __call__(self, sequences):
        texts = [sequence['text'] for sequence in sequences]
        labels = [sequence['label'] for sequence in sequences]
        labels = [self.labels_encoder[label] for label in labels]
        inputs = self.tokenizer(text=texts, return_tensors="pt", padding=True, truncation=True, max_length=self.max_sequence_len)
        inputs.update({'labels': torch.tensor(labels)})

        return inputs


def train(args, model, dataloader, optimizer, scheduler, device, max_grad_norm=1.0):
    model.train()
    true_labels = []
    predictions_labels = []
    total_loss = 0

    # scaler = torch.cuda.amp.GradScaler(enabled=True)
    for i, batch in enumerate(dataloader):

        true_labels += batch['labels'].numpy().flatten().tolist()
        batch = {k: v.type(torch.long).to(device) for k, v in batch.items()}

        with torch.cuda.amp.autocast(enabled=True):
            outputs = model(**batch)
            loss, logits = outputs[:2]
            total_loss += loss.item()
            loss = loss / args.gradient_accumulation_steps
        # scaler.scale(loss).backward()
        loss.backward()

        if (i+1) % args.gradient_accumulation_steps == 0:
            # scaler.unscale_(optimizer)
            torch.nn.utils.clip_grad_norm_(model.parameters(), max_grad_norm)
            optimizer.step()
            # scaler.step(optimizer)
            scheduler.step()
            # scaler.update()
            optimizer.zero_grad()

        logits = logits.detach().cpu().numpy()

        predictions_labels += logits.argmax(axis=-1).flatten().tolist()
    avg_epoch_loss = total_loss / len(dataloader)

    return true_labels, predictions_labels, avg_epoch_loss


def test(model, dataloader, device):

    model.eval()
    true_labels = []
    predictions_labels = []
    total_loss = 0

    for batch in dataloader:

        true_labels += batch['labels'].numpy().flatten().tolist()
        batch = {k: v.type(torch.long).to(device) for k, v in batch.items()}

        with torch.no_grad():
            outputs = model(**batch)

            loss, logits = outputs[:2]
            logits = logits.detach().cpu().numpy()
            total_loss += loss.item()

            predict_content = logits.argmax(axis=-1).flatten().tolist()
            predictions_labels += predict_content

    avg_epoch_loss = total_loss / len(dataloader)

    return true_labels, predictions_labels, avg_epoch_loss


def save(args, model, seed):
    # check if path exist
    path = os.path.join(args.out_dir, args.gpt2, args.dataset)
    is_exit = os.path.exists(path)
    if is_exit:
        torch.save(model.state_dict(), os.path.join(path, 'model_{}_{}_correct_{}.pt'.format(args.dataset, args.correct, seed)))
    else:
        os.makedirs(path)
        torch.save(model.state_dict(), os.path.join(path, 'model_{}_{}_correct_{}.pt'.format(args.dataset, args.correct, seed)))


def grid_para(para_list):

    all_combinations = list(itertools.product(*para_list))

    all_paras = []
    paras_names = ['steps', 'lr', 'bs']
    for i, item in enumerate(all_combinations):
        paras = dict(zip(paras_names, item))
        all_paras.append(paras)

    return all_paras


def hyperparameter_tuning(args, device, train_path, test_path, para_dict, collator, num_label):

    if args.gpt2.startswith("gpt2-large"):
        model_config = GPT2Config.from_pretrained(args.gpt2, output_hidden_states=False, num_labels=num_label)
        model = GPT2ForSequenceClassification.from_pretrained(args.gpt2, config=model_config)
        model.config.pad_token_id = model.config.eos_token_id
        model.to(device)

    elif args.gpt2.startswith("gpt2-xl"):
        model_config = GPT2Config.from_pretrained(args.gpt2, output_hidden_states=False, num_labels=num_label)
        model = GPT2ClassificationParallel.from_pretrained(args.gpt2, config=model_config, low_cpu_mem_usage=True)

        model.model_parallel = True
        model.device_map = {
            0: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21],
            1: [22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47],
        }
        model.config.pad_token_id = model.config.eos_token_id
        model.to(device)
        model.parallelize(model.device_map)

    elif args.gpt2.startswith("gpt-j"):
        model_config = GPTJConfig.from_pretrained("EleutherAI/gpt-j-6B", num_labels=num_label)
        model = GPTJClassificationParallel.from_pretrained("EleutherAI/gpt-j-6B", low_cpu_mem_usage=True, config=model_config)

        model.model_parallel = True
        # model.device_map = {
        #     0: [0, 1, 2, 3, 4, 5, 6],
        #     1: [7, 8, 9, 10, 11, 12, 13],
        #     2: [14, 15, 16, 17, 18, 19, 20],
        #     3: [21, 22, 23, 24, 25, 26, 27],
        # }
        model.device_map = {
            0: [0, 1, 2, 3],
            1: [4, 5, 6, 7],
            2: [8, 9, 10, 11],
            3: [12, 13, 14, 15],
            4: [16, 17, 18, 19],
            5: [20, 21, 22, 23],
            6: [24, 25, 26, 27],
        }

        model.config.pad_token_id = model.config.eos_token_id
        model.to(device)
        model.parallelize(model.device_map)

    train_dataset = ICLData(train_path)
    train_dataloader = DataLoader(train_dataset, batch_size=para_dict["bs"], shuffle=True, collate_fn=collator)

    test_dataset = ICLData(test_path)
    test_dataloader = DataLoader(test_dataset, batch_size=para_dict["bs"], shuffle=True, collate_fn=collator)

    optimizer = AdamW(model.parameters(), lr=para_dict["lr"], eps=1e-8)
    scheduler = get_linear_schedule_with_warmup(optimizer, num_warmup_steps=args.warmup_steps,
                                                num_training_steps=para_dict["steps"])

    if args.distributed:
        model.deparallelize()
        model.to(device)
        model.parallelize(model.device_map)

    for epoch in tqdm(range(para_dict["steps"])):
        train_labels, train_predict, train_loss = train(args, model, train_dataloader, optimizer, scheduler, device)
        train_acc = accuracy_score(train_labels, train_predict)
        print("-Epoch: %.5f  - train_loss: %.5f  - train_acc: %.5f " % (epoch, train_loss, train_acc))

    test_true_labels, predictions_labels, avg_epoch_loss = test(model, test_dataloader, device)
    f1 = f1_score(test_true_labels, predictions_labels, average='macro')

    return f1, model


def main():

    parser = argparse.ArgumentParser()
    parser.add_argument('--device', default='cuda', type=str)
    parser.add_argument("--seeds", type=list, default=[100,13,21,42,87])
    parser.add_argument("--dataset", type=str, default="SST-2")
    parser.add_argument("--task_name", type=str, default=None)
    parser.add_argument("--k", type=int, default=16)
    parser.add_argument("--max_len", type=int, default=1024)
    parser.add_argument("--warmup_steps", type=int, default=0)
    parser.add_argument("--gradient_accumulation_steps", type=int, default=1)

    parser.add_argument("--gpt2", type=str, default="gpt2-large")
    parser.add_argument("--out_dir", type=str, default="hyperparameter")

    parser.add_argument('--imbalance_level', type=str, default='low',
                        help="imbalance level of labels, choosing from low, medium, high")
    parser.add_argument('--label_imbalance', action='store_true')
    parser.add_argument('--distributed', action='store_true')

    args = parser.parse_args()

    device = torch.device(args.device if torch.cuda.is_available() else "cpu")
    print('Device:{}'.format(device))

    if args.gpt2.startswith("gpt2"):
        tokenizer = GPT2Tokenizer.from_pretrained(args.gpt2)
    else:
        tokenizer = AutoTokenizer.from_pretrained("gpt2")

    tokenizer.padding_side = "left"
    tokenizer.pad_token = tokenizer.eos_token

    # random seed
    for seed in args.seeds:
        random.seed(seed)
        np.random.seed(seed)
        torch.manual_seed(seed)
        if torch.cuda.device_count() > 0:
            torch.cuda.manual_seed_all(seed)

        label_ids = load_label(args.task_name)
        num_label = len(label_ids)
        collator = Gpt2ClassificationCollator(tokenizer=tokenizer, labels_encoder=label_ids, max_sequence_len=args.max_len)

        if not args.label_imbalance:
            train_data_path = os.path.join("data_noisy_label", args.dataset,
                                           "{}_{}_{}_train.jsonl".format(args.dataset, args.k, seed))
            test_data_path = os.path.join("data_noisy_label", args.dataset,
                                          "{}_{}_{}_test.jsonl".format(args.dataset, args.k, seed))
        else:
            train_data_path = os.path.join("data_imbalance", "{}_{}".format(args.dataset, args.imbalance_level), "{}_{}_{}_train.jsonl".format(args.dataset, args.k, seed))
            test_data_path = os.path.join("data_imbalance", "{}_{}".format(args.dataset, args.imbalance_level), "{}_{}_{}_test.jsonl".format(args.dataset, args.k, seed))

        print("Training example path", train_data_path)

        para_list = [[50, 100, 200], [1e-5, 2e-5, 3e-5], [2, 4, 8, 16]]
        all_paras = grid_para(para_list)

        all_f1s = []
        for para in all_paras:

            f1, model = hyperparameter_tuning(args, device, train_data_path, test_data_path, para, collator, num_label)

            all_f1s.append(f1)

        best_f1_index = np.argmax(all_f1s)
        print("Dataset {}: finish hyperparameter tuning with {}".format(args.dataset, all_paras[best_f1_index]))

    # save hyper-parameter
        if not args.label_imbalance:
            save_path = os.path.join(args.out_dir, args.gpt2, args.dataset, "{}_{}.json".format(args.dataset, seed))
            is_exit = os.path.exists(os.path.join(args.out_dir, args.gpt2, args.dataset))
            if is_exit:
                with open(save_path, "w") as f:
                    json.dump(all_paras[best_f1_index], f)
                print("Hyper-parameter saved for {}!".format(args.dataset))
            else:
                os.makedirs(os.path.join(args.out_dir, args.gpt2, args.dataset))
                with open(save_path, "w") as f:
                    json.dump(all_paras[best_f1_index], f)
                print("Hyper-parameter saved for {}!".format(args.dataset))
        else:
            save_path = os.path.join(args.out_dir, args.gpt2, "{}_{}".format(args.dataset, args.imbalance_level), "{}_{}.json".format(args.dataset, seed))
            is_exit = os.path.exists(os.path.join(args.out_dir, args.gpt2, "{}_{}".format(args.dataset, args.imbalance_level)))
            if is_exit:
                with open(save_path, "w") as f:
                    json.dump(all_paras[best_f1_index], f)
                print("Hyper-parameter saved for {}!".format(args.dataset))
            else:
                os.makedirs(os.path.join(args.out_dir, args.gpt2, "{}_{}".format(args.dataset, args.imbalance_level)))
                with open(save_path, "w") as f:
                    json.dump(all_paras[best_f1_index], f)
                print("Hyper-parameter saved for {}!".format(args.dataset))


if __name__ == "__main__":
    main()